Fluorinated pentadiene



3,067,264 Patented Dec. 4, 1962 This process is illustrated graphically as follows:

. 1 Benzoyl peroxide FLUQRKNATED EQADKENE O FzBri +CH2=CF2 Reaction mixture Kazimiera L. Faciorek, Trenton, Mich, assignor to Wyan- 80-100 G.

dott e =Cl1lilglal tgorporation, Wyandotte, Midi, a cor- 5 Difluorodibmmm Vinyfidene Distilled 54 C. porntiml 0 Michigan methane fluoride Autoclave at 14 mm.

No Drawing. Fried Ian, 19, 1961, Ser. No. 83,639

1 tilaim. (Ci. 268-6513) 20H2CFzCH2CFiBr 0 1,1,3,3,5,5-hexafluoro-1,5- This invention relates to partially and totally fluorid1br0m0pentane nated 1,4-pentad ene. BrO metric FzCHzO FgBr+C H 1N(C2H5)2 The compositions of the invention conform to the o f Diethylcyolo- 150 175 C.

ormu hexylamine atmos. pressure C FZ=CHC FzCH=C F2 F R F R F (]J I I l i 15 1,1,3,3,5,5-hexafiuoro-1,4- Collect distillate =C(l3-C=(l3 peutadiene at 46 C. F F F Octafiuoropentadiene is prepared in a manner analogous to that set forth above except that 1,2,2-trifiuoroethylcne wherein 1 and 2 members Selected f o h group is used as an initial reactant in lieu of vinylidene fluoride. consisting of hydrogen and fluorine, providing, however, T1115 Process 18 Illustrated graphically as follows:

that R and R are the same. Thus, the compositions of Benzoyl peroxide the invention are 1,1,3,3,5,5-hexafluoro-1,4-pentadiene ac- G F2BT2+CHF=CF2 Reaction mixture cording to the formula: arm-100 o.

1,2,2-trifiuoro- Distilled 62 C. F H F H F ethylene Autoclave at 25 mm. l l BrOFtOHFCFzCHFOFzBt I; 0ctafluoro-l,5-dibromopentane BIO FzCHF C F2CHF C FzBI-l-CsHnN (62115 and 1,1,2,3,3,4,5,5-octafluoro-1,4-pentadicne according to the formula: CFZ=C FOFzCF=CF2 Perfluorinated-1,4-pentadiene Collect distillate l l l l C=O-C-l J-=C The following example further illustrates a method for preparing the compositions of the invention.

The aforementioned compositions are particularly use- Example I ful in the preparation of copolymers and are readily co- T a 0 mlr und ttom flask equipped With a dispolymerizable with such monomers as vinyl chloride, tillirig column, packed with glass helices, there was added vinyl acetate, acrylic acid esters, butadiene, styrene and 25 1111- Of g y followed y grams of 3 5- the like. Elastomeric products prepared from these coheXafluOTO-Lidibfomopentana and grams of y polymers have improved heat stability. cyclohexylamine. The solution was heated and the frac- Also, the fiuorinated 1,4-pentadiencs readily react with lion distilling Over t {0 7 C. Was C llected. The polyols, polythiols or pglyamines in the presence of a distillate was identified by elemental analysis and infrared base to f d i polymers spectrum as being l,1,3,3,5,5-hexafluoro-1,4-per1tadiene. For example, an addition polymer having the following grams of P were collected and the Yield, based recurring Structural unit upon the bromide ion formed, was 87%. The refractive index and elemental analysis for the fluorinated penta- 5O diene distillate are set forth below.

-CI-I -ClF O--CH --'CH O5 Refractive index: N 1.3210

Elemental analysis for C F H is prepared by reacting 1,1,3,3,5,5-hexaflu0ro-1,4-pentacalculated carbon 39%; fluorine 64'77%3 drogen 1.14%

diene with ethylene glycol in the presence of caustic soda in a closed vessel at a temperature of about 100 C. Found-carbon 33'68%; fluorme 29%; hydrogen To prepare hexafluoropentadiene, dibromodifluoro- 203% methane is reacted with vinylidene fluoride in about What is claimed is:

stoichiometric proportions in an autoclave at a tempera- 1,1,3,3,5,5-hexafluoro-1,4-pentadiene according to the ture from about 80 to 100 C. and in the presence of a formula: catalyst such as benzoyl peroxide to obtain 1,1,3,3,5,5-

hexafluoro-1,5-dibrom0pentane; the latter composition is f F K distilled from the reaction mixture and is collected as the C=O-) (3=(} fraction distilling over at 54 C. at 14 mm. of mercury l,

pressure; an alkali metal hydroxide or a tertiary amine such as diethylcyclohexylamine is added to the distillate in ratio of at least 2 mols of base per mol of bromofluoropentane. The mixture is heated in a distillation apparatus UNXTED ATE PATENTS and the fraction distilling over at 46 C. is hexafluoro- 2,833,831 Haszeldine May 6, 1958 pentadiene. The reaction between the base and bromon fiuoropentaiie can be carried out in the presence of a FOREIUN PATENTS solvent such as diglyme. 774,103 Great Britain May 8, 1957 References Cited in the file of this patent 

